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Finding the Fourth Proportional to 45.35, 68.01 and 21.28

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Solution

The fourth proportional to 45.35, 68.01 and 21.28 is: 31.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    45.35 : 68.01 = 21.28 : x
  2. Step 2: Convert to fraction form
    45.35/68.01 = 21.28/x
  3. Step 3: Cross multiply
    45.35x = 68.01 × 21.28
  4. Step 4: Simplify right side
    45.35x = 1,447.25
  5. Step 5: Solve for x
    x = 1,447.25/45.35
  6. Step 6: Final answer
    x = 31.91

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.